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利用改进后的光声压电技术对常用工程塑料的热扩散率进行了测量研究。介绍了改进后的光声压电理论模型,并搭建相应的实验系统。通过对参考样品铝和聚四氟乙烯的检测,完成了实验系统的校准和验证,并对8种常用工程塑料的热扩散率进行了测量,测量结果显示其热扩散率均小于0.4 mm2/s,具有良好的隔热性能。通过理论和实验研究结果表明,改进后的光声压电法可以准确测量工程塑料的热扩散率。
The thermal diffusivity of common engineering plastics was measured with the improved photoacoustic piezoelectric technology. Introduced improved photoacoustic piezoelectric theoretical model, and set up the corresponding experimental system. The calibration and verification of the experimental system were completed by testing aluminum and polytetrafluoroethylene samples. The thermal diffusivities of the eight commonly used engineering plastics were measured. The results showed that the thermal diffusivities were less than 0.4 mm2 / s , With good thermal insulation properties. The theoretical and experimental results show that the improved photoacoustic piezoelectric method can accurately measure the thermal diffusivity of engineering plastics.